<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>OJ注册</title>
    <style>
        body { text-align: center; padding-top: 100px; }
        input { width: 300px; height: 30px; margin: 5px; font-size: 16px; }
        button { width: 308px; height: 35px; background: #4CAF50; color: white; border: none; font-size: 16px; cursor: pointer; }
    </style>
</head>
<body>
    <h1>用户注册</h1>
    <form method="post" action="/register">
        <input type="text" name="username" placeholder="用户名" required><br>
        <input type="password" name="password" placeholder="密码" required><br>
        <button type="submit">注册</button>
    </form>
</body>
</html>